Management system, virtual communication-function management node, and management method for managing virtualization resources in a mobile communication network

ABSTRACT

Leakage of detailed information for implementing a virtual server to execute a communication process on virtualization resources is prevented. There is provided a management system ( 10 ) included in a mobile communication system ( 1 ) configured to include an NFVI ( 60 ) which is virtualization resources including a physical server generated by a VNF ( 70 ) to execute a communication process, and the system includes a VNFM ( 30 ) for managing the VNF ( 70 ), a VIM ( 40 ) for managing the virtualization resources of the NFVI ( 60 ), an orchestrator ( 20 ) for managing all the virtualization resources of the NFVI ( 60 ), wherein the VNFM ( 30 ) includes a retention section ( 31 ) configured to retain detailed information for implementing the VNF ( 70 ) and a virtual server generation request section ( 32 ) configured to request the VIM ( 40 ) to generate the VNF ( 70 ) using the detailed information.

TECHNICAL FIELD

The present invention relates to a management system related to management of a communication system, a virtual communication-function management node, and a management method.

BACKGROUND ART

Conventionally, a computer operates as a virtual machine (VM) according to server virtualization technology for various purposes. Also, according to this technology, designating a node in a core network of a mobile communication network as the virtual machine is being investigated (for example, see Non-Patent Literature 1).

CITATION LIST Non-Patent Literature

[Non-Patent Literature 1] ETSI Group Specification (ETSI GS NFV 002 v1.1.1 (2013. 10)) Network Functions Virtualization (NFV); Architectural Framework

SUMMARY OF INVENTION Technical Problem

A node in a core network of a mobile communication network is implemented, for example, by a virtual network function (VNF) which is a communication function virtualized in virtual machine(s). Management of the above-described mobile communication network by three functional entities of a VNF manager (VNFM), a virtual infrastructure manager (VIM), and an orchestrator is considered. The VNFM has a function of retaining detailed information for implementing the VNF in the virtual machine(s) and managing the VNF. The VIM monitors a state of a physical server (physical server and virtualization resources) on which virtual machine(s) is implemented and generates and deletes the virtual machine(s) and the VNF on the physical server according to control from the VNFM or the orchestrator.

Also, a plurality of physical servers are generally collectively arranged in a data center and the VIM performs a process for a physical server group installed in one or more data centers. Also, the management (resource management) of the physical server group in the data center is performed in a different mounting scheme such as OPENS TACK (registered trademark) or vCenter. The VIM is provided in each mounting scheme in the data center. The orchestrator performs the overall resource management across a plurality of VIMs.

An internal structure of a node (communication node) constituting a mobile communication network that is not currently virtualized differs according to a vendor who provides the node. The internal structure becomes the design know-how of each vendor.

When this node is virtualized as the VNF, the VIM reserves virtualization resources and then generates virtual machine(s) on the reserved virtualization resources and generates the VNF in the virtual machine(s). Also, detailed information retained by the VNFM for implementing the VNF in the virtual machine(s) is necessary to generate the VNF in the virtual machine(s). The detailed information corresponds to the above-described internal structure of a node which is not virtualized and includes the design know-how of each vendor.

The above-described three function entities may be provided by different vendors. When the VNF is implemented, there is the following problem in a configuration in which the detailed information retained by the VNFM is output to, for example, another functional entity such as an orchestrator. That is, when the orchestrator and the VNFM are provided from different vendors, there is a risk in that the detailed information (internal structure) of the VNF is transferred to the orchestrator vendor and the know-how is leaked. Thus, this becomes an impediment of multi-vendor applications.

The present invention has been made in view of the above-described circumstances and an objective of the invention is to provide a management system, a virtual communication-function management node, and a management method capable of preventing the leakage of detailed information for implementing a virtual server to execute a communication process on virtualization resources.

Solution to Problem

To accomplish the above-described objective, a management system according to an embodiment of the present invention is a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and which includes a virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a virtualization resource management node for managing the virtualization resources, and an overall management node for managing all the virtualization resources, wherein the virtualization resource management node includes: a monitoring means configured to monitor a use state of the virtualization resources; a reservation means configured to perform reservation by receiving a request of the reservation of necessary resources for generation of the virtual server among the virtualization resources; and a virtual server generation means configured to generate the virtual server by receiving a request for generating the virtual server on the necessary resources for the generation of the virtual server reserved by the reservation means, wherein the overall management node includes: a request reception means configured to receive a request related to a function of the communication process accompanied by the generation of the virtual server in the physical server, and wherein the management system includes: a reservation request means configured to calculate the necessary resources for the generation of the virtual server on the basis of the request received by the request reception means and the use state of the virtualization resources monitored by the monitoring means and request the virtualization resource management node to perform the reservation, and wherein the virtual communication-function management node includes: a retention means configured to retain detailed information for implementing the virtual server on the virtualization resources; and a virtual server generation request means configured to generate the request for generating the virtual server on the necessary resources reserved by the reservation means using the detailed information retained by the retention means for the virtualization resource management node.

In the management system according to the embodiment of the present invention, the detailed information to be retained by the virtual communication-function management node is used and the virtualization resource management node is requested to generate the virtual server. Accordingly, the notification of the detailed information from the virtual communication-function management node to the overall management node is unnecessary to generate the virtual server. That is, according to the management system according to the embodiment of the present invention, it is possible to prevent the leakage of detailed information for implementing a virtual server to execute a communication process on virtualization resources.

The management system may include a plurality of virtualization, resource management nodes configured to manage the virtualization resources in mutually different schemes, wherein the virtual server generation request means requests the generation of the virtual server by rewriting the detailed information according to a virtualization resource management schemes by the virtualization resource management node. According to this configuration, the virtual server is appropriately generated even when the virtualization resources are managed in a different scheme for each virtualization resource management node.

A virtual communication-function management node included in the above-described communication system has a novel configuration and corresponds to the invention. That is, a virtual communication-function management node according to an embodiment of the present invention is a virtual communication-function management node in a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and which includes the virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a virtualization resource management node for managing the virtualization resources, and an overall management node for managing all the virtualization resources, the virtual communication-function management node including: a retention means configured to retain detailed information for implementing the virtual server on the virtualization resources; and a virtual server generation request means configured to request the virtualization resource management node to generate the virtual server on the reserved resources necessary for the generation of the virtual server among the virtualization resources using the detailed information retained by the retention means.

The present invention can be described as the invention of the management system and the virtual communication-function management node and can also be described as the invention of the management method as follows. These have only different categories and are substantially the same invention and have similar operations and effects.

That is, a management method according to an embodiment of the present invention is a management method which is a method of operating a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and which includes a virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a virtualization resource management node for managing the virtualization resources, and an overall management node for managing all the virtualization resources, wherein the virtual communication-function management node includes: a retention means configured to retain detailed information for implementing the virtual server on the virtualization resources, and wherein the management method includes: a monitoring step of monitoring, by the virtualization resource management node, a use state of the virtualization resources; a reservation step of performing, by the virtualization resource management node, reservation by receiving a request of a reservation of a resources necessary for the generation of the virtual server among the virtualization resources; a virtual server generation step of generating, by the virtualization resource management node, the virtual server by receiving a request for generating the virtual server on the necessary resources for the generation of the virtual server reserved in the reservation step; a request reception step of receiving, by the overall management node, a request related to a function of the communication process accompanied by the generation of the virtual server in the physical server; a reservation request step of calculating, by the management system, the necessary resources for the generation of the virtual server on the basis of the request received in the request reception step and the use state of the virtualization resources monitored in the monitoring step and requesting the virtualization resource management node to perform the reservation; and a virtual server generation request step of requesting, by the virtual communication-function management node, the generation of the virtual server on the necessary resources reserved in the reservation step using the detailed information retained by the retention means for the virtualization resource management node.

Also, a management method according to an embodiment of the present invention is a management method which is a method of operating a virtual communication-function management node in a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and which includes the virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a virtualization resource management node for managing the virtualization resources, and an overall management node for managing all the virtualization resources, wherein the virtual communication-function management node includes: a retention means configured to retain detailed information for implementing the virtual server on the virtualization resources, and wherein the management method includes: a virtual server generation request step of requesting the virtualization resource management node to generate the virtual server on the reserved resources necessary for the generation of the virtual server among the virtualization resources using the detailed information retained by the retention means.

Advantageous Effects of Invention

According to an embodiment of the present invention, it is possible to prevent leakage of detailed information for implementing a virtual server to execute a communication process on virtualization resources because a virtual server is generated without having to provide notification of detailed information from a virtual communication-function management node to an overall management node.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a configuration of a management system and a mobile communication system including the management system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a functional configuration of the management system according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a hardware configuration of a node included in the management system according to an embodiment of the present invention.

FIG. 4 is a table storing information to be used in the management system.

FIG. 5 is a table storing information to be used in the management system,

FIG. 6 is a table storing information to be used in the management system.

FIG. 7 is a table storing information to be used in the management system.

FIG. 8 is a table storing information to be used in the management system.

FIG. 9 is a table storing information to be used in the management system.

FIG. 10 is a table storing information to be used in the management system.

FIG. 11 is a table storing information to be used in the management system.

FIG. 12 is a table storing information to be used in the management system.

FIG. 13 is a table storing information to be used in the management system.

FIG. 14 is a table storing information to be used in the management system.

FIG. 15 is a sequence diagram illustrating a process management method) to be executed during instantiation in the management system according to an embodiment of the present invention.

FIG. 16 is a sequence diagram illustrating a process management method) to be executed during instantiation in the management system according to an embodiment of the present invention.

FIG. 17 is a sequence diagram illustrating a process management method) to be executed during auto-healing in the management system according to an embodiment of the present invention.

FIG. 18 is a sequence diagram illustrating a process (management method) to be executed during auto-healing in the management system according to an embodiment of the present invention.

FIG. 19 is a sequence diagram illustrating a process management method) to be executed during scale-out in the management system according to an embodiment of the present invention.

FIG. 20 is a sequence diagram illustrating a process management method) to be executed during scale-out in the management system according to an embodiment of the present invention.

FIG. 21 is a sequence diagram illustrating a process management method) to be executed during scale-in in the management system according to an embodiment of the present invention.

FIG. 22 is a sequence diagram illustrating a process management method) to be executed during scale-in in the management system according to an embodiment of the present invention.

FIG. 23 is a diagram conceptually illustrating instantiation, scale-out, and scale-in.

FIG. 24 is a flowchart illustrating a process of determining a unit of enhancement.

FIG. 25 is a flowchart illustrating a process of determining a unit of reduction.

FIG. 26 is a table storing necessary information for enhancement or reduction in units of internal functional sections.

FIG. 27 is a table illustrating a relationship between a performance increase/decrease unit of a virtualization function and an embodiment.

FIG. 28 is a diagram illustrating a variation of the embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of a management system, a virtual communication-function management node, and a management method according to the present invention will be described in detail with reference to the drawings. Also, the same elements are assigned the same reference signs and redundant description thereof will be omitted.

FIG. 1 is a diagram illustrating a configuration of a mobile communication system 1 including the management system 10 according to the present embodiment. The mobile communication system 1 is a system for providing a function of mobile communication to a mobile communication terminal (mobile station) (not illustrated). The mobile communication terminal is an apparatus that is used by a user and connects to the mobile communication system (mobile communication network) through wireless communication to perform mobile communication. Specifically, the mobile communication terminal corresponds to a portable telephone or the like. For example, the mobile communication terminal performs communication by establishing a call connection with an opposite node via the mobile communication system 1. The opposite node corresponds to, for example, another mobile communication terminal or a server apparatus for providing various services to the mobile communication terminal, an apparatus (for example, a mobility management entity (MIME) a serving gateway (S-GW), or a PDN gateway (P-GW)) for connecting to another communication network, or the like. The mobile communication terminal can perform mobile communication, for example, when a user of the mobile communication terminal makes a contract with a communication provider of the mobile communication system 1. Also, the mobile communication terminal may be similar to a conventional mobile communication terminal.

As illustrated in FIG. 1, the management system 10 is configured to include the orchestrator 20, a VNFM 30, and a VIM 40. Also, the mobile communication system 1 is configured to include an operations support system/business support system (OSS/BSS) 50, an NFV infrastructure (NFVI) 60, a virtual network function (VNF) 70, and an element management system (EMS) 80. These components constitute a core network of a mobile communication system 1 (mobile communication network). Also, components between which mutual transmission/reception of information is necessary are connected by wire or the like to enable the transmission/reception of the information.

In the mobile communication system 1 according to the present embodiment, a communication function is provided to the mobile communication terminal by virtual server(s) operating in virtual machine(s) implemented on a physical server. That is, the mobile communication system 1 is a virtualized mobile communication network. The communication function is provided to the mobile communication terminal by executing a communication process according to the communication function through the virtual machine(s).

The NFVI 60 includes physical resources, a virtualization layer, and virtualization resources constituting a virtualized environment. The physical resources include calculation resources, storage resources, and transfer resources. The virtualization layer virtualizes the physical resources and provides the virtualized physical resources to the VNF 70 (APL) (for example, a hypervisor). The virtualization resources are virtualized infrastructure resources to be provided to the VNF 70. That is, the NFVI 60 is a virtualization resource configured to include the physical server which is a physical server apparatus for performing a communication process in the mobile communication system 1. The physical server is configured to include a CPU (a core, a processor), a memory, and a storage means such as a hard disk. Generally, a plurality of physical servers constituting the NFVI 60 are arranged at a position of a data center (DC) or the like. In the data center, the arranged physical servers are connected through a network inside the data center and are configured to perform mutual transmission/reception of information. Also, in the mobile communication system 1, a plurality of data centers are provided. The data centers are connected by the network and the physical servers provided in different data centers can perform mutual transmission/reception of the information via their networks.

The VNF 70 is (a function of executing a communication process provided in) virtual server(s) which is a virtual communication processing node to execute the communication process. The VNF 70 is implemented in the NFVI 60. The VNF 70 is implemented, for example, using virtual machine (VM) technology, by allocating the CPU provided in the NFVI 60 for the VNF 70, implementing virtual machine(s) on the allocated CPU, and executing a program on the virtual machine(s). The VNF 70 is generally generated (implemented) according to the communication process to be executed. Also, the VNF 70 may be configured to include a plurality of virtual network function components (VNFCs) which are its components.

The mobile communication system 1 includes one or more (or a plurality of) VNFs 70. The VNF 70 corresponds to a node such as a call session control function (CSCF) or an application server (AS) in IMS. Alternatively, for example, the VNF 70 corresponds to a node such as a serving GPRS support node (SGSN) in a general packet radio service (GPRS) system which is one of the mobile communication systems and a node such as a mobility management entity (MME) or a serving gateway (S-GW) in a Long Term Evolution/Evolved Packet Core (LTE/EPC) system.

The EMS 80 is a node for monitoring and controlling the VNF 70. The EMS 80 is also virtually implemented in the NFVI 60 as in the VNF 70. The EMS 80 is generated in association with the VNF 70 (for example, in a one-to-one relationship with the VNF 70 as illustrated in FIG. 1). The EMS 80 monitors and controls the associated VNF 70. The EMS 80 performs fault, configuration, accounting, performance, and security (FCAPS) management of the VNF 70. The EMS 80 may be virtually implemented as described above or physically implemented to avoid the complexity of management in performing the FCAPS management.

The OSS/BSS 50 is a node which performs service management in the mobile communication system 1 and provides the management system 10 with an instruction related to a communication function in the mobile communication system 1. For example, the OSS/BSS 50 instructs the management system 10 to start up a new communication function (communication service). Also, the OSS/BSS 50 receives information from the EMS 80 and provides the management system 10 or the EMS 80 with an instruction on the basis of the information. Also, the OSS/BSS 50 can be operated by a communication provider related to the mobile communication system 1.

The orchestrator 20 which is a component of the management system 10 is an overall management node (functional entity) for managing the entire NFVI 60 which is a virtualization resource. The orchestrator 20 receives an instruction from (an OSS 51 of) the OSS/BSS 50 and performs a process according to the instruction. The orchestrator 20 performs management of an infrastructure and communication service across all virtualization resources of a mobile communication network. The orchestrator 20 implements a communication service constituted of a plurality of VNFs 70 in a proper place via the VNFM 30 and the VIM 40. For example, life cycle management (specifically, for example, generation, update, scale control, and event collection) of a service, distribution/reservation/allocation management of resources, service/instance management, and policy management (specifically, for example, reservation/allocation, optimum arrangement of resources based on geography/laws, etc.) across the entire mobile communication network.

The VNFM 30 which is a component of the management system 10 is a virtual communication-function management node (functional entity) which manages the VNF 70. A plurality of VNFMs 30 are provided in the mobile communication system 1. In this case, the VNFM 30 to be managed for each VNF 70 may be predetermined. The VNFM 30 performs life cycle management of the VNF 70 (APL). The VNFM 30 performs overall control related to virtualization of the VNF 70. For example, it performs instance generation, update, scale control, termination, and auto-healing of the VNF 70.

The VIM 40, which is a component of the management system 10, is a virtualization resource management node (functional entity) which manages the virtualization resources (infrastructure resources) of units in which the VNF 70 is implemented in the NFVI 60. Specifically, it performs management of allocation/update/collection of resources, association of virtual resources and physics, and management of lists of hardware resources and SW resources (hypervisor). Generally, the VIM 40 performs management for each data center (station building). The management of the virtualization resources can be performed in a scheme according to the data center. A management scheme of the data center (a mounting scheme of management resources) is of a type such as OPENSTACK or vCenter. Generally, the VIM 40 is provided for each management scheme of the data center. That is, the management system 10 includes a plurality of VIMs 40 which manage the virtualization resources of units in which the VNF 70 is implemented in the NFVI 60 in mutually different schemes. Also, it is unnecessary for units of virtualization resources managed in different management schemes to be units of data centers.

Also, the orchestrator 20, the VNFM 30, and the VIM 40 are implemented by executing a program on a physical server apparatus (however, they are not limited to implementation in virtualization and may be implemented in virtualization separately from the management system). The orchestrator 20, the VNFM 30, and the VIM 40 may be implemented by separate physical server apparatuses or implemented by the same server apparatus. The orchestrator 20, the VNFM 30, and the VIM 40 (or programs for implementing them) may be provided from separate vendors.

Also, the above-described architecture is based on that disclosed in Non-Patent Literature 1. Also, the mobile communication system 1 may include components other than the above-described components to implement a mobile communication function. For example, the mobile communication system 1 may include an apparatus of a base station, an OpenFlow network (including a virtualized element as described above), etc.

Next, functions according to the present embodiment provided in the management system 10 will be described. As illustrated in FIG. 2, the orchestrator 20 includes a request reception section 21 and a reservation request section 22. The request reception section 21 is a request reception means which receives a request related to a function of a communication process accompanied by the generation of the VNF 70 in the physical server included in the NFVI 60 from (the OSS 51 of) the OSS/BSS 50.

The reservation request section 22 is a reservation request means which requests the VIM 40 to reserve necessary resources for the generation of the VNF 70 in the NFVI 60 by calculating the necessary resources for the generation of the VNF 70 on the basis of a request received by the request reception section 21, a use state of the NFVI 60 monitored by the VIM 40, information from the VNFM 30, etc.

As illustrated in FIG. 2, the VNFM 30 includes a retention section 31 and a virtual server generation request section 32. The retention section 31 is a retention means which retains detailed information for implementing the VNF 70 on the NFVI 60. The virtual server generation request section 32 is a virtual server generation request means which requests the VIM 40 to generate the VNF 70 on necessary resources reserved in the NFVI 60 using the detailed information retained in the retention section 31. Also, the VNFM 30 may request the generation of the VNF 70 by rewriting the detailed information according to a virtualization resource management schemes (NFVI 60) by the VIM 40.

As illustrated in FIG. 2, the VIM 40 includes a monitoring section 41, a reservation section 42, and a virtual server generation section 43. The monitoring section 41 is a monitoring means which monitors the use state of the NFVI 60. The reservation section 42 is a reservation means which performs reservation by receiving a request of the reservation of the necessary resources for the generation of the VNF 70 in the NFVI 60 from the orchestrator 20. The virtual server generation section 43 is a virtual server generation means which generates the VNF 70 by receiving the request for generating the VNF 70 on the necessary resources for the generation of the VNF 70 reserved by the reservation section 42 from the VNFM 30.

The above function is a function related to the present embodiment provided in the management system 10. Also, in the description of a process by the management system 10 using a sequence diagram, functions of the orchestrator 20, the VNFM 30, and the VIM 40 according to the present embodiment will be described in more detail. Also, functions which are not included in the above-described functional sections are provided in the orchestrator 20, the VNFM 30, and the VIM 40, but description of these functions is also included in the description of the process by the management system 10 using the sequence diagram.

FIG. 3 illustrates a hardware configuration of a server apparatus constituting the orchestrator 20, the VNFM 30, and the VIM 40 included in the management system 10 according to the present embodiment. As illustrated in FIG. 3, the server apparatus is configured to include a computer provided with hardware such as a CPU 101, a random access memory (RAM) 102 and a read only memory (ROM) 103 which are main storage apparatuses, a communication module 104 for performing communication, and an auxiliary storage apparatus 105 such as a hard disk. These components are operated by a program, etc., so that the functions of the orchestrator 20, the VNFM 30, and the VIM 40 described above and to be described below are exhibited. Also, the orchestrator 20, the VNFM 30, and the VIM 40 may be constituted of a computer system including a plurality of server apparatuses. Also, a node other than the above-described nodes included in the mobile communication system 1 may also be implemented by a server apparatus having the above-described hardware configuration. The above configuration is a configuration of the management system 10 according to the present embodiment.

Next, a management method which is a process to be executed by the management system 10 according to the present embodiment will be described using tables of FIGS. 4 to 14 and sequence diagrams of FIGS. 15 to 22. Hereinafter, processes when (1) instantiation, (2) auto-healing, (3) scale-out, and (4) scale-in are performed in the mobile communication system 1 will be described for each of the above-described cases. Also, FIG. 23 illustrates overviews of the instantiation, the scale-out, and the scale-in.

First, a process when (1) instantiation is performed will be described using the sequence diagrams of FIGS. 15 and 16. Also, the sequence diagram illustrated in FIG. 16 is a continuation of the sequence diagram of FIG. 15 (in a time-series manner). The instantiation is the generation of a new VNF 70 according to the communication service to provide a new communication service (communication function) in the mobile communication system 1. According to the instantiation, the new communication service is provided in the mobile communication system 1.

First, in the orchestrator 20, a resource use state inquiry is performed for each VIM 40 (S001). In the VIM 40, the monitoring section 41 receives the resource use state inquiry. The monitoring section 41 monitors the resource use state of the NFVI 60 serving as a management target of the VIM 40. Information indicating the resource use state obtained as a monitoring result is transmitted from the monitoring section 41 to the orchestrator 20 as a resource use state inquiry response (S002, monitoring step). The orchestrator 20 receives the information. The processes of S001 and S002 are periodically performed for each VIM 40.

This information is information of each data center (DC) as shown in Table T1 of FIG. 4(a) and is obtained by associating resource information of the virtual machine(s) and the network (NW) and information indicating provided functions. That is, this information is state information of resources of the entire mobile communication system 1 (mobile communication network). The information is constantly retained in a network total resource information database provided in the orchestrator 20.

In Table T1 of FIG. 4(a), an available bandwidth is an available bandwidth of a communication path (of an exit of the data center) between the data center and the outside of the data center. An available external address is an address assignable to the VNF 70 and is necessary for the VNF 70 to communicate with another VNF 70 or an element other than the VNF 70. The provided function is a function related to communication capable of being provided by dedicated hardware or software in the data center. Specifically, there is a high-speed packet processing function (for example, DPDK of Intel Corporation), a function (for example, SR-IOV) of bypass technology of a virtualization layer, or the like.

Next, a request (signal (1)) of service generation related to a communication service is transmitted from (the OSS 51 of) the OSS/BSS 50 to the orchestrator 20. The communication service is, for example, voice communication and communication in which an image or a moving image (rich media) is transmitted and received (a communication service differs according to each type of data to be transmitted). This request is a request related to a function of the communication process accompanied by the generation of the VNF 70 in the physical server included in the NFVI 60. In the orchestrator 20, the request reception section 21 receives the signal (S003, request reception step).

The signal includes information indicating a service ID serving as a number for uniquely identifying a generated service, a communication service to be generated, a performance condition, and network information. Specifically, “communication service 1” in the communication service, “100” in the performance condition, and “DC 1 connection and bandwidth of 5 Gbps or more” indicating <DC connected to DC 1 in a bandwidth of 5 Gbps or more> in the NW (network) condition are included (set) in the signal.

The performance condition is a normalized index value for indicating capability in control (generation, enhancement, reduction, or the like) for the VNF 70 and a service configured by the VNF 70. The performance condition is pre-negotiated between the OSS 51 and the VNFM 30.

Next, the VNF 70 (virtualized function) and the VNFM 30 (management function) constituting a communication service specified by information included in the signal are specified from operation data pre-registered in the orchestrator 20. Specifically, “VNF 10” and “VNF 21” serving as the VNF 70 constituting “communication service 1” are derived from Table T2 of FIG. 5(a) which is the operation data and the fact that the VNFM 30 of “VNF 10” is “VNFM 1” and the VNFM 30 of “VNF 21” is “VNFM 2” is derived from Table T3 of FIG. 5(b) which is the operation data (A, S004).

The subsequent processes of S005 to S024 are executed sequentially or in parallel in units of VNFs 70. Here, the generation of “VNF 10” is shown.

Next, the orchestrator 20 selects a data center in which “VNF 10” can be arranged using the operation condition of Table T4 of FIG. 5(c), the NW condition input according to the signal (1), and the connection configuration of the data center of Table T5 of FIG. 5(e) to generate the above-described specified “VNF 10.” Candidates “DC 2,” “DC 3,” “DC 4,” and “DC 5” can be obtained as the data center in which “VNF 10” can be arranged from Table T4 of FIG. 5(c) pre-registered in the orchestrator 20. Next, it is determined that “DC 5” does not satisfy the condition from “DC 1 connection and bandwidth of 5 Gbps or more” of the input NW condition and connection information indicating that the data centers connected to “DC 1” capable of being obtained from Table T5 of FIG. 5(e) pre-registered in the orchestrator 20 are “DC 2,” “DC 3,” and “DC 4,” and the candidate data centers become “DC 2,” “DC 3,” and “DC 4.”

Next, the orchestrator 20 reads resource information of the selected “DC 2,” “DC 3,” and “DC 4” from Table T1 of FIG. 4(a) of the network total resource information database accumulated through periodic collection. The read resource information is shown in Table T8 of FIG. 4(b). Next, a VNF identification number “VNF_001” is dispatched as a number for uniquely identifying the VNF 70 to be generated (B, S005).

Next, a combination table (Table T8 of FIG. 4(b)) of resource information read to be “DC 2,” “DC 3,” and “DC 4” extracted as candidates for the data center capable of being arranged in B (S005), “100” of the performance condition input in the signal (1), “VNF 10” serving as a generation target VNF type, and the dispatched VNF identification number “VNF_001” are transmitted as a necessary resource inquiry (signal (2)) to “VNFM 1” which is the VNFM 30 of “VNF 10” read in the above-described A (S004) (S006).

Also, an embodiment which does not include resource information of each data center in S006 is also possible. In this case, in place of the resource information of each data center, an identification number of the VIM 40 which manages each data center is read from Table T6 of FIG. 5(d) pre-registered in the orchestrator 20 and included in information to be transmitted in S006. For example, a combination in which the VIM 40 of “DC 2” is “VIM 1,” the VIM 40 of “DC 3” is “VIM 1,” and the VIM 40 of “DC 4” is “VIM 2” is included in information to be transmitted.

The signal (2) is received in “VNFM 1.” In “VNFM 1” receiving the signal (2), it is confirmed whether the resource information for each data center is set (whether the resource information is included in the signal (2)). When the VIM identification number is set in place of the resource information, “VNFM 1” requests the VIM 40 to provide the resource information of each data center and collects the resource information of each data center. For example, “VNFM 1” inquires of the resource information of “DC 2” and “DC 3” for “VIM 1” and the resource information of “DC 4” for “VIM 2” received in the signal (2) and can obtain Table T8 of FIG. 4(b) (S007 and S008).

In “VNFM 1” obtaining the resource information (Table T8 of FIG. 4(b)) of the data center in the signal (2) or the processes of S007 and S008, detailed information of “VNF 10” set in the VNF type of the signal (2) is read from the VNF detailed information database previously retained (registered) in the retention section 31 of the “VNFM 1.” In the detailed information, a combination of resource information (VM), resource information (NW), and function information according to a VNF internal structure and a performance condition of Table T9 of FIG. 6 is registered. A model number of Table T9 of FIG. 6 is an identifier of each combination. An image file of the resource information (VM) retains information for configuring VM as a file and is used when the VNF 70 starts up. The image file is pre-stored in any place within a communication network from which the image file can be read by the VIM 40. The VNF 70 is constituted of one or more internal functional sections and resources for generating the VNF 70 are secured by the VIM 40 for each internal functional section. Arrangement/startup information includes correspondence relationships among the resources of each internal functional section secured by the VIM 40 and the image file, setting information for starting up the VNF 70 using the image file, a startup procedure for each internal functional section, and a reduction procedure for each internal functional section when the VNF 70 is deleted. NW configuration information of the resource information (NW) is information indicating an NW connection type of the internal functional section of the VNF 70.

In “VNFM 1,” the resource information and the function information necessary for the performance condition “100” of the VNF type “VNF 10” received in the signal (2) from the read detailed information (Table T9 of FIG. 6) are extracted (C1, S009).

An available data center is extracted by comparing the extracted resource information and function information with the available resource information and the provided function of the resource information (Table T8 of FIG. 4(b)) obtained in the signal (2) or the processes of S007 and S008. Specifically, it is determined that “VNF 10” requires “function 1” and “function 2” from Table T9 of FIG. 6 and data centers capable of providing “function 1” and “function 2” are “DC 2” and “DC 3” from Table T8 of FIG. 4(b).

Next, necessary resource information is derived to generate the VNF 70 in resources provided by an available data center. Specifically, from Table T8 of FIG. 4(b), it can be determined that “DC 2” can provide high and low CPU performance and “DC 3” can provide low CPU performance. Here, the CPU performance indicates a classification related to calculation performance based on an operation frequency of the CPU, the number of physical cores, fast calculation technology, or the like. This is collated with the CPU performance of Table T9 of FIG. 6 read in the process of S009 (it is determined that the necessary resource information for the generation of the VNF 70 is available in the data center) and Table T10 of FIG. 7(a) can be obtained as a combination of resource information capable of being obtained by “DC 2” and “DC 3.” In detail, it can be seen that “VNF 10” is constituted of the internal functional sections “VNFC 100” and “VNFC 101” from Table T9 of FIG. 6 read in the process of S009. Further, in the case of the performance condition “100,” it can be seen that the internal functional section “VNFC 100” can be generated by virtual resources (VM and NW) of the model number “001” using the CPU performance “High” or the model number “002” using the CPU performance “Low” and the internal functional section “VNFC 101” can be generated by virtual resources (VM and NW) of the model number “005” using the CPU performance “High” or the model number “006” using the CPU performance “Low.” Therefore, the number of combinations of necessary virtual resources for generating the VNF 70 having the performance condition “100” of the VNF type “VNF 10” indicated by the signal (2) is 4 in “DC 2” in which the CPU performance “High” and “Low” can be provided and 1 in “DC 3” in which only the CPU performance “Low” can be provided, and Table T10 of FIG. 7(a) can be obtained. The service ID, the VNF type, and the VNF identification number of the signal (2) and Table T9 of FIG. 6 of the detailed information are stored (C2, S010).

Next, Table T10 of FIG. 7(a) indicating the derived combination of the resource information and the data center is returned from “VNFM 1” to the orchestrator 20 (signal (3), S011).

The orchestrator 20 receives the signal (3) through the reservation request section 22. Table T13 of FIG. 7(b) can be obtained by assigning priority to the combination table (Table T10 of FIG. 7(a)) of the resource information and the data centers received in the signal (3) on the basis of a priority index of Table T12 of FIG. 5(f) pre-registered in the orchestrator 20. A specific procedure will be described. First priority from Table T12 of FIG. 5(f) becomes a bandwidth between DCs. It can be seen that DCs serving as the candidates from Table T10 of FIG. 7(a) are “DC 2” and “DC 3” and an NW bandwidth between “DC 1” and “DC 2” is greater than an NW bandwidth between “DC 1” and “DC 3” from Table T5 of FIG. 5(e), d “DC 2” has high priority. Next, second priority from Table T12 of FIG. 5(f) becomes the CPU performance. From Table T10 of FIG. 7(a), it can be seen that the priority of combination 2 of only the CPU performance “High” among combinations of “DC 2” is highest and the priority of combination 1 of only the CPU performance “Low” is lowest. For combinations 3 and 4 of the CPU performance “High” and “Low,” a small VM storage region of third priority is used. From Table T10 of FIG. 7(a), it can be seen that the number of VMs of 300 GB in the VM storage region is (1+2) in combination 3, the number of VMs of 300 GB is 2 and the number of VMs of 500 GB is 1 in combination 4, and the priority of combination 3 having a small capacity of the VM storage region is high. Thereby, Table T13 of FIG. 7(b) in which the priority is assigned to the combination of necessary resources can be obtained (D, S012).

Next, reservation of the VIM 40 for managing the data center is performed in the order of combination of high priority. The reservation request section 22 sets the necessary resources of combination 2 having highest priority and “DC 2” of the target in Table T13 of FIG. 7(b) and a resource reservation request is transmitted to “VIM 1” which is a management function of “DC 2” read from Table T6 of FIG. 5(d) (signal (4), S013, reservation request step). In the case of a combination of priority 1 of Table T13 of FIG. 7(b), information of Table T14 of FIG. 8(a) becomes necessary resource information (VM and NW) (is set as necessary resource information). When the resource reservation fails, a reservation request of the combination of the next highest priority is performed (F, return from the process S016).

In “VIM 1,” a signal (4) is received. In “VIM 1” receiving the signal (4), the reservation section 42 confirms whether necessary resources shown in Table T14 of FIG. 8(a) for which “DC 2” set in the signal (4) is requested in the signal (4) can be secured on the basis of an inside management area resource information database and a reservation number for which the resources are reserved is dispatched (E, S014, reservation step). In “VIM 1,” the reserved “DC 2” and reserved resource information (Table T14) are stored along with the reservation number. In “VIM 1,” a reservation number serving as a response when the resources can be secured and an error serving as a response when the resources cannot be secured are provided to the orchestrator 20 (signal (5), S015).

In the orchestrator 20, a signal (5) from “VIM 1” is received. In the orchestrator 20 in which the signal (5) from “VIM 1” is received, a resource reservation result is confirmed (F, S016). When the reservation of the resources is impossible (F, NG of S016), reservation of a combination of the next highest priority is performed by returning to the process of D (S012) again.

When the reservation succeeds, the orchestrator 20 sets the service ID dispatched in the process of S005, “VIM 1” serving as a VIM identification number of a resource reservation destination, a VIM type obtained from Table T6 of FIG. 5(d), a reservation number received in the signal (5) from “VIM 1,” and resource information of Table T14 of FIG. 8(a) serving as reservation resource information (VM and NW) and requests “VNFM 1” to generate “VNF 10” (signal (6), S017). Also, in the orchestrator 20, the service ID, the VNF type, the VNF identification number, the reservation number, the reserved “VIM 1,” and the reserved “DC 2” are stored.

In “VNFM 1,” the virtual server generation request section 32 receives the signal (6). Next, the virtual server generation request section 32 reads Table T9 of FIG. 6 of the detailed information stored in C2 (S010) from the service ID received in the signal (6) and determines the arrangement/startup information and the NW (network) configuration information corresponding to the model numbers “001” and “005” of Table T14 of FIG. 8(a) of the reserved resource information (VM and NW) received in the signal (6). Next, the virtual server generation request section 32 dispatches and assigns a VM identification number to the generated virtual machine (VM).

Next, in “VNFM 1,” a format of the arrangement/startup information and the NW configuration information is changed according to the VIM type received in the signal (6) (detailed information is rewritten according to a management scheme of the VIM 40) by the virtual server generation request section 32 (G, S108, virtual server generation request step). Also, this rewriting can be performed according to the conventional technology.

Next, the virtual server generation request section 32 notifies “VIM 1” of a reservation destination received in the signal (6) of the arrangement/startup information and the NW configuration information for which the format is changed for “VIM 1” and the reservation number received in the signal (6) and requests “VIM 1” to generate “VNF 10” (signal (7), S109, virtual server generation request step). Information set as the arrangement/startup information and the NW configuration information becomes Table T15 of FIG. 8(b). In “VNFM 1,” the service ID, the VNF type, and the VNF identifier (VNF identification number) stored in C2 (S010) are stored in association with the VIM identification number and the reservation number received in the signal (6), the internal functional section, and the VM identification number.

In “VIM 1,” the virtual server generation section 43 receives the signal (7). Next, the virtual server generation section 43 specifies resources of “DC 2” secured in the process of E (S014) as resources for starting up the VNF 70 from a reservation number received in the signal (7). Next, the virtual server generation section 43 reads image files of VM and VNF in “DC 2” on the basis of the arrangement/startup information and the NW configuration information received in the signal (7) and generates/starts up VM and the VNF 70.

In “VIM 1,” the virtual server generation section 43 assigns “external IP address 01” and “external IP address 02” as a number of external addresses designated in the signal (7) to VM from a pre-allocated external IP address band. In “VIM 1,” information of Table T16 of FIG. 9(a) is stored by associating the reservation number, the data center, the VM identification number of “VNFM 1,” the physical apparatus (HW), the allocated resource information, and the transmission source VNFM 30 of the signal (7) (H, S020, virtual server generation step).

Next, the virtual server generation section 43 provides “VNFM 1” with a response of Table T17 of FIG. 9(b) in which a correspondence relation of “external IP address 01” and “external IP address 02” allocated during VM generation and VM is set as the NW (network) information in a signal (8) (S021 of FIG. 16).

In “VNFM 1,” the NW information set in the signal (8) is added to information associated with a service ID stored in the process of G (S018) and stored. Content of the information becomes Table T18 of FIG. 9(c) (J, S022).

When VNF generation succeeds, a notification of the signal (9) in which “external IP address 01” and “external IP address 02” are set as NW information is provided from “VNFM 1” to the orchestrator 20 (S023).

In the orchestrator 20, the signal (9) is received. In the orchestrator 20 receiving the signal (9), it is confirmed that the VNF generation is completed. In the orchestrator 20, the information of the VNF 70 stored in the process of S017 and the NW information set in the signal (9) are stored in association with the service ID. Content of the information becomes Table T19 of FIG. 9(d) (K, S024).

For “VNF 21,” procedures of B to K (processes of S005 to S024) are similarly executed. In the orchestrator 20, Table T21 of FIG. 10(a) in which a result of generating “VNF 21” is reflected in a result of “VNF 10” can be obtained. “VNF 21” is assumed to be generated in the same data center as “VNF 10” (L, S025).

The orchestrator 20 confirming that the generation of “VNF 10” and “VNF 21” determined to be generation targets in A (S004) is completed specifies “VIM-NW” which is the VIM 40 for managing a network between the data centers by Table T6 of FIG. 5(d) and a notification of IP addresses of NW information of “VNF 10” and “VNF 21” from Table T21 of FIG. 10(a) is provided to request a connection between VNFs (signal (10), S026). In “VIM-NW,” a process according to the request is performed and its response is transmitted to the orchestrator 20 (S027).

Also, a notification of VNF types, VNF identification numbers, performance, and NW information of “VNF 10” and “VNF 21” received in the signal (9) is provided in the signal (10) from the orchestrator 20 to the OSS 51 (S028).

In the OSS 51, a signal (11) is received and the request content of the signal (1) and the result of the signal (11) are associated and retained as Table T2 of FIG. 10(a) (M, S029). “VNF 21” is added to Table T18 of FIG. 9(c) provided in the VNFM 30 when “VNF 21” is generated subsequently to “VNF 10,” so that Table T23 of FIG. 10(c) is generated (N, S030). Although Table T23 of FIG. 10(c) indicates information to be managed by the VNFM 30 (total), it may be managed for each VNFM 30 (for each VNF 70 to be managed by the VNFM 30) (the same is true for Table T23 of FIG. 10(c) below).

After the completion of communication service generation, the orchestrator 20, the VNFM 30, and the VIM 40 retain information of Table T21 of FIG. 10(a), Table T23 of FIG. 10(c), and Table T16 of FIG. 9(a), respectively, and use the retained information in control such as enhancement, reduction, and termination of the service or a maintenance operation for malfunction, congestion, construction, etc.

For example, the VIM 40 specifies VM related to the hardware when a hardware malfunction occurs using information of Table T16 of FIG. 9(a) and the VNFM 30, which is its management function section, or the orchestrator 20 is notified of the specified VM and auto-healing or maintenance personnel can cope with a malfunction. Also, even for an increase/decrease or termination operation on VM, resources having an influence are specified and used to manage resource information. Likewise, the orchestrator 20 and the VNFM 30 also use the correspondence relationship between Table T21 of FIG. 10(a) and Table T23 of FIG. 10(c) to execute an operation such as enhancement, reduction, or termination on a communication service or an internal function.

Also, correspondence relationship information can also be aggregated into an operating system (OSS 51) of the entire communication network and used to monitor/operate the entire communication network. The above process is a process when (1) instantiation is performed.

Next, a process when (2) auto-healing is performed will be described using sequence diagrams of FIGS. 17 and 18. Also, the sequence diagram illustrated in FIG. 18 is a continuation of the sequence diagram of FIG. 17 (in a time-series manner). In the auto-healing, the VNF 70 to operate normally is automatically generated when the VNF 70 does not operate normally due to abnormality of hardware or software. Through the auto-healing, a communication function is automatically recovered in the mobile communication system 1.

The OSS 51 operates while monitoring a state of the VNF 70 generated in an instantiation process (procedure) through the EMS 80 which is an operation management system as in the conventional system. The EMS 80 detecting abnormality (for example, non-response) of the VNF 70 during the operation notifies the OSS 51 of the abnormality (S101) and the OSS 51 can re-arrange the VNF 70. An example in which the OSS 51 receiving information from the EMS 80 detecting an abnormal operation (for example, non-response) of “VNF 10” between “VNF 10” and “VNF 21” generated in the instantiation process determines a rearrangement in which “VNF 10” is replaced and requests the orchestrator 20 to generate a replacement VNF 70 will be described.

A signal (1) in which a service ID used when a rearrangement source VNF 70 is generated, a VNF identification number “VNF_001” for identifying a rearrangement target, “100” which is a performance condition indicating performance to be rearranged (for example, a performance index value equivalent to that of a current state), and a “separate DC” indicating the installation for a DC separate from the current DC as the NW condition are set is transmitted from the OSS 51 to the orchestrator 20 (S102).

In the orchestrator 20, the request reception section 21 receives a service rearrangement request (S102, request reception step). In the orchestrator 20 receiving the service rearrangement request, the service ID and the VNF identification number are used and the VNF type and the data center are specified as information related to the VNF 70 of a rearrangement source from data stored when the VNF 70 is generated. The fact that the VNF type corresponding to the service ID and the VNF identification number “VNF_001” is “VNF 10,” and the data center is “DC 2” is derived from Table T21 of FIG. 10(a) and the fact that the VNFM 30 of “VNF 10” is “VNFM 1” is derived from Table T3 of FIG. 5(b) (A, S103).

Next, the orchestrator 20 selects a data center in which “VNF 10” can be arranged using the operation condition of Table T4 of FIG. 5(c), the NW condition input according to the signal (1), and the connection configuration of the data center of Table T5 of FIG. 5(e) to rearrange the above-described specified “VNF 10.” Candidates “DC 2,” “DC 3,” “DC 4,” and “DC 5” can be obtained as the data center in which “VNF 10” can be arranged from Table T4 of FIG. 5(c). Next, the candidate data centers are “DC 3” and “DC 5” based on connection information capable of being obtained from Table T5 of FIG. 5(e) in which data centers connected to “DC 2” in which the VNF 70 of the rearrangement source is arranged are “DC 1,” “DC 3,” and “DC 5” as data centers separate from “DC 2” of the rearrangement source VNF 70 from the input NW condition.

Next, the orchestrator 20 reads resource information of “DC 3” and “DC 5” serving as the candidates from Table T1 of FIG. 4(a) of the network total resource information database accumulated through periodic collection. The read resource information is shown in Table T31 of FIG. 11(a). Next, a \INF identification number “VNF_010” is dispatched as a number for uniquely identifying the VNF 70 to be rearranged (B, information).

Next, a combination table (Table T31 of FIG. 11(a)) of resource information read to be “DC 3” and “DC 5” extracted as candidates for the data center capable of being arranged in B (S104), a rearrangement source VNF identification number “VNF_001,” a VNF type “VNF 10,” and a service ID and “100” of the performance condition input in the signal (1) are transmitted as a necessary resource inquiry (signal (2)) to “VNFM 1” which is the VNFM 30 of “VNF 10” read in the above-described A (S103) (S105).

Also, an embodiment which does not include resource information of each data center in S105 is also possible. In this case, in place of the resource information of each data center, an identification number of the VIM 40 which manages each data center is read from Table T6 of FIG. 5(d) and included in information to be transmitted in S106. For example, a combination in which the VIM 40 of “DC 3” is “VIM 1” and the VIM 40 of “DC 5” is “VIM 3” is included in information to be transmitted.

The signal (2) is received in “VNFM 1.” In “VNFM 1” receiving the signal (2), it is confirmed whether the resource information for each data center is set (whether the resource information is included in the signal (2)). When the VIM identification number is set in place of the resource information, “VNFM 1” requests the VIM 40 to provide the resource information of each data center and collects the resource information of each data center. For example, “VNFM 1” inquires of the resource information of “DC 3” for “VIM 1” and the resource information of “DC 5” for the “VIM 3” received in the signal (2) and can obtain Table T31 of FIG. 11(a) (S106 and S107).

In “VNFM 1” obtaining the resource information (Table T31 of FIG. 11(a)) of the data center in the signal (2) or the processes of SI 06 and S107, detailed information of “VNF 10” set in the VNF type of the signal (2) is read from the VNF detailed information database previously retained (registered) in the retention section 31 of the “VNFM 1.” In the detailed information, resource information (VM), resource information (NW), and function information according to a VNF internal structure and a performance condition of Table T9 of FIG. 6 are registered.

In “VNFM 1,” the resource information and the function information necessary for the performance condition “100” of the VNF type “VNF 10” received in the signal (2) from the read detailed information (Table T9 of FIG. 6) are extracted (C1, S108).

An available data center is extracted by comparing the extracted resource information and function information with the available resource information and the provided function of the resource information (Table T31 of FIG. 11(a)) obtained in the signal (2) or the processes of S106 and S107. Specifically, it is determined that “VNF 10” requires “function 1” and “function 2” from Table T9 of FIG. 6 and “DC 3” and “DC 5” of the candidates can provide “function 1” and “function 2” together from Table T31 of FIG. 11(a).

Next, necessary resource information is derived to generate the VNF 70 in resources provided by an available data center. Specifically, from Table T31 of FIG. 11(a), it can be determined that “DC 3” can provide low CPU performance and “DC 5” can provide high CPU performance. This is collated with the CPU performance of Table T9 of FIG. 6 read in the process of S108 and Table T32 of FIG. 11(b) can be obtained as a combination of resource information capable of being obtained by “DC 3” and “DC 5.” In detail, it can be seen that “VNF 10” is constituted of the internal functional sections “VNFC 100” and “VNFC 101” from Table T9 of FIG. 6 read in the process of S108. Further, in the case of the performance condition “100,” it can be seen that the internal functional section “VNFC 100” can be generated by virtual resources (VM and NW) of the model number “001” using the CPU performance “High” or the model number “002” using the CPU performance “Low” and the internal functional section “VNFC 101” can be generated by virtual resources (VM and NW) of the model number “005” using the CPU performance “High” or the model number “006” using the CPU performance “Low.” Therefore, the number of combinations of necessary virtual resources for generating the VNF 70 having the performance condition “100” of the VNF type “VNF 10” indicated by the signal (2) is 1 in “DC 3” in which the CPU performance “Low” can be provided and is also 1 in “DC 5” in which the CPU performance “High” can be provided, and Table T32 of FIG. 11(b) can be obtained as a combination of resource information capable of being obtained by “DC 3” and “DC 5.” The service ID, the rearrangement VNF type, and the rearrangement VNF identification number of the signal (2) and Table T9 of FIG. 6 of the detailed information are stored (C2, S109).

Next, Table T32 of FIG. 11(b) indicating the derived combination of the resource information and the data center is returned from “VNFM 1” to the orchestrator 20 (signal (3), S110).

The orchestrator 20 receives the signal (3) through the reservation request section 22. A priority index of Table T12 of FIG. 5(f) is applied to a combination table (Table T32 of FIG. 11(b)) of resource information received in the signal (3) and data centers. It can be determined that the first priority is a bandwidth between data centers from Table T12 and a bandwidth between “DC 2” and “DC 3” is greater than the bandwidth between “DC 2” and “DC 3” and a bandwidth between “DC 2” and “DC 5” of the rearrangement source VNF 70 from Table T5 of FIG. 5(e). On the basis of this, the priority is assigned and Table T33 of FIG. 11(c) can be obtained (D, S111).

Next, reservation of the VIM 40 for managing the data center is performed in the order of combination of high priority. The reservation request section 22 sets the necessary resources of combination 1 of “DC 3” having highest priority and “DC 3” of the target in Table T33 of FIG. 11(c) and a resource reservation request is transmitted to “VIM 1” which is a management function of “DC 3” read from Table T6 of FIG. 5(d) (signal (4), S112, reservation request step). In the case of a combination of priority 1 of Table T33 of FIG. 11(c), information of Table T34 of FIG. 12(a) becomes necessary resource information (VM and NW). When the resource reservation fails, a reservation request of the combination of the next highest priority is generated (F, return from the process S115).

In “VIM 1,” a signal (4) is received. In “VIM 1” receiving the signal (4), the reservation section 42 confirms whether necessary resources shown in Table T34 of FIG. 12(a) for which “DC 3” set in the signal (4) is requested in the signal (4) can be secured on the basis of an inside management area resource information database and a reservation number 10 for which the resources are reserved is dispatched (E, S113, reservation step). In “VIM 1,” the reserved “DC 3” and reserved resource information (Table T14) are stored along with the reservation number 10. In “VIM 1,” a reservation number serving as a response when the resources can be secured and an error serving as a response when the resources cannot be secured are provided to the orchestrator 20 (signal (5), S114).

In the orchestrator 20, a signal (5) from “VIM 1” is received. In the orchestrator 20 in which the signal (5) from “VIM 1” is received, a resource reservation result is confirmed (F, S115). When the reservation of the resources is impossible (F, NG of S115), reservation of a combination of the next highest priority is performed by returning to the process of D (S111) again.

When the reservation succeeds, the orchestrator 20 sets the service ID when the rearrangement source VNF 70 is generated, “VIM 1” serving as a VIM identification number of a resource reservation destination, a VIM type obtained from Table T6 of FIG. 5(d), a reservation number received in the signal (5) from “VIM 1,” and resource information of Table T34 of FIG. 12(a) serving as reservation resource information (VM and NW) and requests “VNFM 1” to rearrange “VNF 10” (signal (6), S116). Also, in the orchestrator 20, the service ID, the VNF type, the VNF identification number, the reservation number, the reserved “VIM 1,” and the reserved “DC 3” are stored as information of the rearrangement VNF.

In “VNFM 1,” the virtual server generation request section 32 receives the signal (6). Next, the virtual server generation request section 32 reads Table T9 of FIG. 6 of the detailed information stored in C2 (S109) from the service ID received in the signal (6) and determines the arrangement/startup information and the NW (network) configuration information corresponding to the model numbers “002” and “006” of Table T34 of FIG. 12(a) of the reserved resource information (VM and NW) received in the signal (6). Next, the virtual server generation request section 32 dispatches and assigns a VM identification number to the generated virtual machine (VM).

Next, in “VNFM 1,” a format of the arrangement/startup information and the NW configuration information is changed according to the VIM type received in the signal (6) (detailed information is rewritten according to a management scheme of the VIM 40) by the virtual server generation request section 32 (G, S117, virtual server generation request step).

Next, the virtual server generation request section 32 notifies “VIM 1” of a reservation destination received in the signal (6) of the arrangement/startup information and the NW configuration information for which the format is changed for “VIM 1” and the reservation number received in the signal (6) and requests “VIM 1” to generate “VNF 10” (signal (7), S118, virtual server generation request step). Information set as the arrangement/startup information and the NW configuration information becomes Table T35 of FIG. 12(b). In “VNFM 1,” the service ID, the VNF type, and the VNF identification number stored in C2 (S109) are stored in association with the VIM identification number and the reservation number received in the signal (6), the internal functional section read from Table T9 of FIG. 6, and the dispatched VM identification number.

In “VIM 1,” the virtual server generation section 43 receives the signal (7). Next, the virtual server generation section 43 specifies resources of “DC 3” secured in the process of E (S113) as resources for starting up the VNF 70 from a reservation number received in the signal (7). Next, the virtual server generation section 43 reads image files of VM and the VNF in “DC 3” on the basis of the arrangement/startup information and the NW configuration information received in the signal (7) and generates/starts up VM and the VNF 70.

In “VIM 1,” the virtual server generation section 43 assigns “external IP address 10” and “external IP address 11” as a number of external addresses designated in the signal (7) to VM from a pre-allocated external IP address band. In “VIM 1,” information of Table T41 of FIG. 14(a) is stored by associating the VM identification number of “VNFM 1” and the physical apparatus (HW) in addition to the reservation number of the process of E (S113) and the data center (H, S119 of FIG. 18, virtual server generation step).

Next, the virtual server generation section 43 provides “VNFM 1” with Table T36 of FIG. 12(c) in which the external IP address allocated during VM generation is set as NW information as a response in a signal (8) (S120).

In “VNFM 1,” the NW information set in the signal (8) is added to information associated with a service ID stored in the process of G (S117) and stored. Content of the information becomes Table T37 of FIG. 13(a) (J, S121). Although Table T37 of FIG. 13(a) shows information to be managed by the VNFM 30 (total), it may be managed for each VNFM 30 (for each VNF 70 to be managed by the VNFM 30) (the same is true for Table T37 of FIG. 13(a) below).

When VNF generation succeeds, a notification of the signal (9) in which “external IP address 10” and “external IP address 11” are set as NW information is provided from “VNFM 1” to the orchestrator 20 (S122).

In the orchestrator 20, the signal (9) is received. In the orchestrator 20 receiving the signal (9), it is confirmed that the generation of the VNF 70 is completed. In the orchestrator 20, the information of the rearranged VNF 70 stored in the process of S116 and the NW information set in the signal (9) are added to Table T21 of FIG. 10(a) created during the generation in association with the service ID and stored. Content of the information becomes Table T38 of FIG. 13(b) (K, S123).

NW information of “VNF 21” which is the VNF 70 to which the rearrangement source VNF 70 is connected is read from Table T38 of FIG. 13(b) created during the generation and the NW connection is performed. A connection request in which “external IP address 20” for communication of “VNF 21” read from Table T38 and “external IP address 10” for communication of the rearranged “VNF 10” received in the signal (9) are set is sent to “VIM-NW” to manage a network between VNFs 70 specified from Table T6 of FIG. 5(d) (signal (10), S124). In “VIM-NW,” the signal (10) is received and a response to the signal (10) is transmitted to the orchestrator 20 (S125). In “VIM-NW” in which the signal (10) is received, connections of “external IP address 20” and “external IP address 10” are performed (L, S126).

In the orchestrator 20, a response (S125) from “VIM-NW” for the connection request of S124 is received. Next, when the connection between the VNFs 70 is completed, the orchestrator 20 notifies the OSS 51 of the VNF type, the VNF identification number, the performance, and the NW information of “VNF 10” received in the signal (9) using a signal (11) (S127). The OSS 51 receives the signal (11) and retains Table T39 of FIG. 13(c) in which request content of the signal (1) and a result of the signal (11) are associated and appended to Table T22 of FIG. 10(a) of the generation time (M, S128). Thereafter, the OSS 51 resumes the operation by notifying “VNF 21” of NW information of the rearranged “VNF 10” through the EMS 80 for a notification of switching of the opposite “VNF 10.” After confirming that communication of the rearranged “VNF 10” and “VNF 21” of a connection destination starts, the OSS 51 starts a maintenance operation such as stop or termination. The above process is a process when (2) auto-healing is performed.

Next, a process when (3) scale-out is performed using the sequence diagrams of FIGS. 19 and 20 will be described. Also, the sequence diagram illustrated in FIG. 20 is a continuation of the sequence diagram illustrated in FIG. 19 (in a time-series manner). In the scale-out, a VNF 70 having the same function as a relevant VNF 70 is generated in order to distribute a load of the VNF 70 when the load of the VNF 70 increases. According to the scale-out, an appropriate load distribution or the like is performed in the mobile communication system 1.

The OSS 51 operates while monitoring a state of the VNF 70 generated in an instantiation process (procedure) through the EMS 80 which is an operation management system as in the conventional system. The EMS 80 receives a notification of state information from the VNF 70 (S201) and transmits the received state information to the OSS 51 (S202). The above-described process is performed periodically. On the basis of the state information during the operation, the OSS 51 can detect a load increase of the VNF 70 and enhance the performance of the VNF 70 having an increased load greater than a given level during the operation. An example in which the OSS 51 detecting the load increase of “VNF 10” between “VNF 10” and “VNF 21” generated in the instantiation process determines the enhancement of 100% of the performance of the VNF 70 and sends a request to the orchestrator 20 will be described.

A signal (1) in which a service ID used when an enhancement source VNF 70 is generated, a VNF identification number “VNF_001” for identifying an enhancement target, “100” which is a performance condition indicating performance to be enhanced (for example, a performance index value equivalent to that of a current state), and a “separate DC” indicating the installation for a DC separate from the current DC as the NW condition are set is transmitted from the OSS 51 to the orchestrator 20 (S203).

In the orchestrator 20, the request reception section 21 receives a service enhancement request (S203, request reception step). In the orchestrator 20 receiving the service enhancement request, the service ID and the VNF identification number are used and the VNF type and the data center are specified as information related to the VNF 70 of an enhancement source from data stored when the VNF 70 is generated. The fact that the VNF type corresponding to the service ID and the VNF identification number “VNF_001” is “VNF 10,” and the data center is “DC 2” is derived from Table T21 of FIG. 10(a) and the fact that the VNFM 30 of “VNF 10” is “VNFM 1” is derived from Table T3 of FIG. 5(b) (A, S204).

Next, the orchestrator 20 selects a data center in which “VNF 10” can be arranged using the operation condition, the NW condition input according to the signal (1), and the connection configuration of the data center of Table T5 of FIG. 5(e) to enhance the above-described specified “VNF 10.” Candidates “DC 2,” “DC 3,” “DC 4,” and “DC 5” can be obtained as the data center in which “VNF 10” can be arranged from Table T4 of FIG. 5(c). Next, the candidate data centers become “DC 3” and “DC 5” based on connection information capable of being obtained from Table T5 of FIG. 5(e) in which data centers connected to “DC 2” in which VNFs 70 of an enhancement source and a connection destination are arranged are “DC 1,” “DC 3,” and “DC 5” as data centers separate from “DC 2” of the enhancement source VNF 70 from the input NW condition.

Next, the orchestrator 20 reads resource information of “DC 3” and “DC 5” serving as the candidates from Table T1 of FIG. 4(a) of the network total resource information database accumulated through periodic collection. The read resource information is shown in Table T31 of FIG. 11(a). Next, a VNF identification number “VNF_010” is dispatched as a number for uniquely identifying the VNF 70 to be enhanced (B, S205).

Next, an enhancement VNF identification number “VNF_010,” Table T31 of FIG. 11(a) serving as information of candidates for the data center capable of being arranged, a VNF type “VNF 10,” “VNF_001” in the enhancement source VNF identification number, and a service ID and “100” of the performance condition input in the signal (1) are transmitted as a necessary resource inquiry (signal (2)) to “VNFM 1” which is the VNFM 30 of “VNF 10” read in the above-described A (S204) (S206).

Also, an embodiment which does not include resource information of each data center in S206 is also possible. In this case, in place of the resource information of each data center, an identification number of the VIM 40 which manages each data center is read from Table T6 of FIG. 5(d) and included in information to be transmitted in S206. For example, a combination in which the VIM 40 of “DC 3” is “VIM 1” and the VIM 40 of “DC 5” is “VIM 3” is included in information to be transmitted.

The signal (2) is received in “VNFM 1.” In “VNFM 1” receiving the signal (2), it is confirmed whether the resource information for each data center is set (whether the resource information is included in the signal (2)). When the VIM identification number is set in place of the resource information, “VNFM 1” requests the VIM 40 to provide the resource information of each data center and collects the resource information of each data center. For example, “VNFM 1” inquires of the resource information of “DC 3” for “VIM 1” and the resource information of “DC 5” for the “VIM 3” received in the signal (2) and can obtain Table T31 of FIG. 11(a) (S207 and S208).

In “VNFM 1” obtaining the resource information (Table T31 of FIG. 11(a)) of the data center in the signal (2) or the processes of S207 and S208, detailed information of “VNF 10” set in the VNF type of the signal (2) is read from the VNF detailed information database previously retained (registered) in the retention section 31 of the “VNFM 1.” In the detailed information, resource information (VM), resource information (NW), and function information according to a VNF internal structure and a performance condition of Table 19 of FIG. 6 are registered.

In “VNFM 1,” the resource information and the function information necessary for the performance condition “100” of the VNF type “VNF 10” received in the signal (2) from the read detailed information (Table T9 of FIG. 6) are extracted (C1, S209).

An available data center is extracted by comparing the extracted resource information and function information with the available resource information and the provided function of the resource information (Table T31 of FIG. 11(a)) capable of being obtained in the signal (2) or the processes of S207 and S208. Specifically, it is determined that “VNF 10” requires “function 1” and “function 2” from Table T9 of FIG. 6 and “DC 3” and “DC 5” of the candidates can provide “function 1” and “function 2” together from Table T31 of FIG. 11(a).

Next, necessary resource information is derived to generate the VNF 70 in resources provided by an available data center. Specifically, from Table T31 of FIG. 11(a), it can be determined that “DC 3” can provide low CPU performance and “DC 5” can provide high CPU performance. This is collated with the CPU performance of Table T9 of FIG. 6 read in the process of S209 and Table T32 of FIG. 11(b) can be obtained as a combination of resource information capable of being obtained by “DC 3” and “DC 5.” In detail, it can be seen that “VNF 10” is constituted of the internal functional sections “VNFC 100” and “VNFC 101” from Table T9 of FIG. 6 read in the process of S209. Further, in the case of the performance condition “100,” it can be seen that the internal functional section “VNFC 100” can be generated by virtual resources (VM and NW) of the model number “001” using the CPU performance “High” or the model number “002” using the CPU performance “Low” and the internal functional section “VNFC 101” can be generated by virtual resources (VM and NW) of the model number “005” using the CPU performance “High” or the model number “006” using the CPU performance “Low.” Therefore, the number of combinations of necessary virtual resources for generating the VNF 70 having the performance condition “100” of the VNF type “VNF 10” indicated by the signal (2) is 1 in “DC 3” in which the CPU performance “Low” can be provided and is also 1 in “DC 5” in which the CPU performance “High” can be provided, and Table T32 of FIG. 11(b) can be obtained as a combination of resource information capable of being obtained by “DC 3” and “DC 5.” The service ID, the enhancement VNF type, and the enhancement VNF identification number of the signal (2) and Table T9 of FIG. 6 of the detailed information are stored (C2, S210).

Next, Table T32 of FIG. 11(b) indicating the derived combination of the resource information and the data center is returned from “VNFM 1” to the orchestrator 20 (signal (3), S211),

The orchestrator 20 receives the signal (3) through the reservation request section 22. A priority index of Table T12 of FIG. 5(f) is applied to a combination table (Table T32 of FIG. 11(b)) of resource information received in the signal (3) and data centers. It can be determined that the first priority is a bandwidth between data centers from Table T12 and a bandwidth between “DC 2” and “DC 3” is greater between the bandwidth between “DC 2” and “DC 3” and a bandwidth between “DC 2” and “DC 5” of “VNF 21” of the connection destination VNF 70 from Table T5 of FIG. 5(e). On the basis of this, the priority is assigned and Table T33 of FIG. 11(c) can be obtained (D, S212).

Next, reservation for the VIM 40 for managing the data center is performed in the order of combination of high priority. The reservation request section 22 sets the necessary resources of combination 1 of “DC 3” having highest priority and “DC 3” of the target in Table T33 of FIG. 11(c) and a resource reservation request is transmitted to “VIM 1” which is a management function of “DC 3” read from Table T6 of FIG. 5(d) (signal (4), S213, reservation request step). In the case of a combination of priority 1 of Table T33 of FIG. 11(c), information of Table T34 of FIG. 12(a) becomes necessary resource information (VM and NW). When the resource reservation fails, a reservation request of the combination of the next highest priority is generated (F, return from the process S216).

In “VIM 1,” the signal (4) is received. In “VIM 1” receiving the signal (4), the reservation section 42 confirms whether necessary resources shown in Table T34 of FIG. 12(a) for which “DC 3” set in the signal (4) is requested in the signal (4) can be secured on the basis of an inside management area resource information database and a reservation number 10 for which the resources are reserved is dispatched (E, S214, reservation step). In “VIM 1,” the reserved “DC 3” and reserved resource information are stored along with the reservation number 10. In “VIM 1,” a reservation number serving as a response when the resources can be secured and an error serving as a response when the resources cannot be secured are provided to the orchestrator 20 (signal (5), S215).

In the orchestrator 20, a signal (5) from “VIM 1” is received. In the orchestrator 20 in which the signal (5) from “VIM 1” is received, a resource reservation result is confirmed (F, S216). When the reservation of the resources is impossible (F, NG of S216), reservation of a combination of the next highest priority is performed by returning to the process of D (S212) again.

When the reservation succeeds, the orchestrator 20 sets the service ID when the enhancement source VNF 70 is generated, “VIM 1” serving as a VIM identification number of a resource reservation destination, a VIM type obtained from Table T6 of FIG. 5(d), a reservation number received in the signal (5) from “VIM 1,” and resource information of Table T34 of FIG. 12(a) serving as reservation resource information (VM and NW) and requests “VNFM 1” to enhance “VNF 10” (signal (6), S217). Also, in the orchestrator 20, the service ID, the VNF type, the VNF identification number, the reservation number, the reserved “VIM 1,” and the reserved “DC 3” are stored as information of the enhancement VNF.

In “VNFM 1,” the virtual server generation request section 32 receives the signal (6). Next, the virtual server generation request section 32 reads Table T9 of FIG. 6 of the detailed information stored in C2 (S210) from the service ID received in the signal (6) and determines the arrangement/startup information and the NW (network) configuration information corresponding to the model numbers “002” and “006” of Table T34 of FIG. 12(a) of the reserved resource information (VM and NW) received in the signal (6). Next, the virtual server generation request section 32 dispatches and assigns a VM identification number to the generated virtual machine (VM).

Next, in “VNFM 1,” a format of the arrangement/startup information and the NW configuration information is changed according to the VIM type received in the signal (6) (detailed information is rewritten according to a management scheme of the VIM 40) by the virtual server generation request section 32 (G S218, virtual server generation request step).

Next, the virtual server generation request section 32 notifies “VIM 1” of a reservation destination received in the signal (6) of the arrangement/startup information and the NW configuration information for which, the format is changed for “VIM 1” and the reservation number received in the signal (6) and requests “VIM 1” to generate “VNF 10” (signal (7), S219, virtual server generation request step). Information set as the arrangement/startup information and the NW configuration information becomes Table T35 of FIG. 12(b). In “VNFM 1,” the service ID, the VNF type, and the VNF identification number stored in C2 (S210) are stored in association with the VIM identification number and the reservation number received in the signal (6), the internal functional section read from Table T9 of FIG. 6, and the dispatched VM identification number.

In “VIM 1,” the virtual server generation section 43 receives the signal (7). Next, the virtual server generation section 43 specifies resources of “DC 3” secured in the process of E (S214) as resources for starting up the VNF 70 from a reservation number received in the signal (7). Next, the virtual server generation section 43 reads image files of VM and the \INF in “DC 3” on the basis of the arrangement/startup information and the NW configuration information received in the signal (7) and generates/starts up VM and the VNF 70.

In “VIM 1,” the virtual server generation section 43 assigns “external IP address 10” and “external IP address 11” as a number of external addresses designated in the signal (7) to VM from a pre-allocated external IP address band. In “VIM 1,” information of Table T41 of FIG. 14(a) is stored by associating the VM identification number of “VNFM 1,” the allocated resource information, and the physical apparatus (HW) in addition to the reservation number of the process of E (S214) and the data center (H, S220 of FIG. 20, virtual server generation step).

Next, the virtual server generation section 43 provides “VNFM 1” with Table T36 of FIG. 12(c) in which the external IP address allocated during VM generation is set as NW information as a response in a signal (8) (S221).

In “VNFM 1,” the NW information set in the signal (8) is added to information associated with a service ID stored in the process of G (S218) and stored. Content of the information becomes Table T37 of FIG. 13(a) (J, S222).

When VNF generation succeeds, a notification of a signal (9) in which “external IP address 10” and “external IP address 11” are set as NW information is provided from “VNFM 1” to the orchestrator 20 (S223).

In the orchestrator 20, the signal (9) is received. In the orchestrator 20 receiving the signal (9), it is confirmed that the generation of the VNF 70 is completed. In the orchestrator 20, the information of the enhanced VNF 70 stored in the process of S217 and the NW information set in the signal (9) are added to Table T21 of FIG. 10(a) created during the generation in association with the service ID and stored. Content of the information becomes Table T38 of FIG. 13(b) (K, S224).

NW information of “VNF 21” which is the VNF 70 to which the enhancement source VNF 70 is connected is read from Table T38 of FIG. 13(b) created during the generation and the NW connection is performed. A connection request in which “external IP address 20” for communication of “VNF 21” read from Table T38 and “external IP address 10” for communication of the enhanced “VNF 10” received in the signal (9) are set is sent to “VIM-NW” to manage a network between VNFs 70 specified from Table T6 of FIG. 5(d) (signal (10), S225). In “VIM-NW,” the signal (10) is received and a response to the signal (10) is transmitted to the orchestrator 20 (S226). In “VIM-NW” in which the signal (10) is received, connections of “external IP address 20” and “external IP address 10” are performed (L, S227).

In the orchestrator 20, a response (S226) from “VIM-NW” for the connection request of S225 is received. Next, when the connection between the VNFs 70 is completed, the orchestrator 20 notifies the OSS 51 of the VNF type of “VNF 10,” the VNF identification number, the performance, and the NW information received in the signal (9) using a signal (11) (S228). The OSS 51 receives the signal (11) and retains Table T39 of FIG. 13(c) in which request content of the signal (1) and a result of the signal (11) are associated and appended to Table T22 of FIG. 10(a) of the generation time (M, S229). The above process is a process when (3) scale-out is performed.

Next, a process when (4) scale-in is performed using the sequence diagrams of FIGS. 21 and 22 will be described. Also, the sequence diagram illustrated in FIG. 22 is a continuation of the sequence diagram illustrated in FIG. 21 (in a time-series manner). In the scale-in, VNFs 70 may be aggregated when there are a plurality of VNFs 70 having the same function with a low load or the like. According to the scale-in, the appropriate use of resources is performed in the mobile communication system 1.

The OSS 51 operates while monitoring a state of the VNF 70 that is generated in an instantiation process (procedure) through the EMS 80 which is an operation management system as in the conventional system and is further enhanced in the scale-out process (procedure). The EMS 80 receives a notification (signal (1)) of state information from the VNF 70 (S301) and transmits the received state information (signal (1)) to the OSS 51 (S302). The above-described process is performed periodically. On the basis of the state information during the operation, the OSS 51 can detect a load decrease of VNF and reduce the performance of the VNF 70 having a decreased load less than a given level during the operation. An example in which the OSS 51 detecting the decreased load less than the given level for a plurality of “VNFs 10” enhanced in the above-described scale-out process determines the reduction of the total performance of the VNF 10 and sends a request to the orchestrator 20 will be described.

In the OSS 51, management is performed as shown in Table T39 of FIG. 13(c) for a service type of the VNF 70 generated, enhanced, or reduced through the orchestrator 20.

Even when a load amount of the VNF 70 is periodically collected from the VNF 70 as in the above-described signal (1) and VNFs 70 having the same function are integrated in the OSS 51, scale-in integration of distributed processing is determined as long as a load sufficiently falls within a rated load. For example, in the OSS 51, a VNF having a smaller load amount among a plurality of VNFs 70 (“VNF_001” and “VNF_010”) acquired in the signal (1) (message (1)) becomes a deletion target (A, S303).

In the OSS 51, Table T39 of FIG. 13(c) is referred to, an opposite node (“VNF_021” in Table T39) connected to the VNF 70 serving as the deletion target is determined in the same service, and a configuration change is indicated by a signal (2) via the EMS 80 so that newly generated traffic for the opposite node is not transmitted to the VNF 70 (“VNF_010”) of the deletion target (S304 and S305).

The signal (2) is received in “VNF_021,” the configuration change is performed so that no new traffic is transmitted to the VNF 70 (“VNF_010”) of the deletion target for traffic for which the load is distributed to “VNF_001” and “VNF_010” opposite to each other (S306), and a response message (3) (signal (3)) is returned to the OSS 51 via the EMS 80 (S307 and S308).

In the OSS 51, the response message (3) (signal (3)) is received. Next, in the OSS 51, the VNF 70 (“VNF_010”) serving as the deletion target is obstructed by a message (4) (signal) via the EMS 80 and a user expulsion request is generated (S309 and S310).

In “VNF_010,” the completion of a process on already accommodated user traffic is awaited (or the process is forcibly terminated) and the process converges (C, S311). Next, a response message (5) (signal (5)) is returned from “VNF_010” to the OSS 51 via the EMS 80 (S312 and S313).

In the OSS 51, the response message (5) (signal (5)) is received. Next, in the OSS 51, a signal (6) in which the service ID used during VNF generation, a VNF identification number “VNF_010” for identifying a reduction target, a performance condition indicating performance to be reduced, and “100” which is a performance value desired to be reduced are set is generated (S314) and transmitted as a service reduction request to the orchestrator 20 (S315 of FIG. 22).

In the orchestrator 20, a service reduction request is received. In the orchestrator 20 receiving the service reduction request, the service ID and the VNF identification number are used and the VNF type and the data center are specified as information related to the VNF 70 of the reduction target from data stored when the VNF 70 is created or enhanced. The fact that the VNF type corresponding to the service ID and the VNF identification number “VNF_010” is “VNF 10,” and the data center is “DC 3” is derived from Table T38 of FIG. 13(b) and the fact that the VNFM 30 of “VNF 10” is “VNFM 1” is derived from Table T3 of FIG. 5(b) (E, S316).

Next, the orchestrator 20 can obtain a service ID when the VNF 70 serving as the deletion target is generated, the VNF type serving as the deletion target, the VNF identification number, the VIM identification number (“VIM 1”) of the reservation destination, and the reservation number (“10”) from Table T38 of FIG. 13(b) in order to delete the above-described specified “VNF_010” (F, S317). The orchestrator 20 requests “VNFM 1” to delete “VNF_010” by a signal (7) including the information (S318).

In “VNFM 1,” the signal (7) is received. In “VNFM 1,” the service ID, the VNF type, the VNF identification number, the VIM identification number, and the reservation number can be obtained from the VNF reduction request message received in the signal (7) and a reduction procedure can be obtained from Table T9 of FIG. 6(a) (G, S319). Next, “VNFM 1” requests “VIM 1” to reduce the relevant VM according to the reservation number by a signal (8) which is the VNF reduction request message (S320).

In “VIM 1,” the reservation number can be obtained from the VNF reduction request message received in the signal (8) and the reduction of VM is executed by obtaining the DC number “DC 3” serving as the deletion target and the VM identification number from Table T41 of FIG. 14(a) (H, S321). Next, in “VIM 1,” a VNF reduction response is returned to the orchestrator 20 via “VNFM 1” by a signal (9) (S322 and S323). In “VNFM 1,” Table T23 of FIG. 10(c) obtained by deleting “VNF_010” from Table T37 of FIG. 13(a) is retained.

In the orchestrator 20, the VNF reduction response (VNF deletion response message) is received. Next, in the orchestrator 20, a release request of a connection between VNFs 70 performing deletion is generated from Table T38 of FIG. 13(b) (J, S324) and transmitted to “VIM-NW” by a signal (10) (S325).

In “VIM-NW,” the signal (10) is received and a response to the release request is performed (S326). Also, in “VIM-NW,” the connection between VNFs 70 is released (K, S327).

In the orchestrator 20, the response from “VIM-NW” is received, Table T21 of FIG. 10(a) obtained by deleting “VNF_010” from Table T38 of FIG. 13(c) is retained, and the service reduction response is sent to the OSS 51 by a signal (11) (S328).

In the OSS 51, the request content of the signal (1) and the result of the signal (11) are associated and information of Table T43 of FIG. 14(b) obtained by reducing VNF from Table T39 of FIG. 13(c) during the generation is retained (S329). The above process is a process when (4) scale-in is performed.

Although an enhancement/reduction procedure is shown in units of virtual communication functions (VNFs 70) in the above-described embodiment, the VNF 70 is generally constituted of one or more internal functional sections (VNFCs) and an enhancement/reduction operation is also executed in units of internal functional sections.

In the above-described present embodiment, VNF detailed information (Table T9 of FIG. 6) in common with instantiation in scale-out, scale-in, and auto-healing is used. However, enhancement/reduction of a unit of an internal functional section is possible if a procedure of extracting an enhancement/reduction pattern of the internal functional section which satisfies a performance condition designated on the basis of a combination of internal functional sections of the VNF 70 previously registering and generating (starting up) the enhancement/reduction pattern of the unit of the internal functional section as VNF detailed information is added.

At this time, it is necessary to designate a VNF identification number for identifying an operation target of a unit of VNF as an identifier capable of specifying an operation of the unit of the internal functional section. For example, the upper-limit number of internal functional sections (Table TX of FIG. 26(a)) within one VNF and an enhancement/deletion pattern of a unit of a VNF internal function (Table TY of FIG. 26(b)) are additionally pre-registered as detailed information in the database of the VNFM 30.

The scale-out process is performed as follows. When detailed information of an enhancement source VNF is read in a process (procedure) C1 in the scale-out process of FIG. 19, a determination of the enhancement unit illustrated in the flowchart of FIG. 24 is added. An example in which the performance condition “100” is received as the enhancement of VNF 10 in the signal (2) of S206 will be described. The detailed information (Table T37 of FIG. 13(a)) of the enhancement source VNF is read in the process (procedure) C1, the number of VMs of the enhancement source VNF is compared with the upper-limit number of Table TX of FIG. 26(a), and it is determined that the enhancement of the unit of VNFC is performed when the number of VMs is less than the upper-limit number. Next, a configuration of the model number “101” is extracted as resource information and function information necessary for the performance condition “100” from Table TY of FIG. 26(b) pre-registered in the VNFM 30.

Whether the unit of enhancement is designated as the unit of the VNF 70 or the unit of the internal functional section can be indicated from the OSS 51 without being determined by the VNFM 30. After the enhancement pattern of the unit of the internal functional section is extracted from Table TY, a similar procedure to the embodiment of the above-described scale-out is applied.

The scale-in process is performed as follows. When detailed information of the reduced VNF is read in the process (procedure) G in the scale-in process of FIG. 22, the determination of a unit of reduction illustrated in the flowchart of FIG. 25 is added and one reduction pattern is extracted. For the VNFM 30 to determine the unit of reduction, the OSS 51 sends a request to the VNFM 30 by including the performance condition “100” received in the signal (6) in the signal (7) in the sequence diagram of FIG. 22. The VNFM 30 can obtain the VNF identification number and the performance condition from the received signal (7). The VNFM 30″ reads detailed information (Table T37 of FIG. 13(a)) of a reduction source VNF to be retained on the basis of the VNF identification number received in the signal (7), compares the number of VMs of the reduction source VNF with the minimum number of components of the table of FIG. 26(a), and it is determined that the reduction of the unit of VNFC is performed in the case of a minimum configuration. Next, a configuration of the model number “101” is extracted as resource information and function information corresponding to the performance condition “100” from Table TY of FIG. 26(b) pre-registered in the VNFM 30 and resources of the reduction target and the procedure are obtained.

Whether the unit of reduction is designated as the unit of the VNF 70 or the unit of the internal functional section can be indicated from the OSS 51 without being determined by the VNFM 30. After the reduction pattern of the unit of the internal functional section is extracted from Table TY, a similar procedure to the embodiment of the above-described scale-in is applied.

The relationship between the unit of a performance increase/decrease of a virtualization function and an embodiment is illustrated in FIG. 27.

A variation of the embodiment of the present invention is illustrated in FIG. 28. In FIG. 28, the term “selection” refers to the extraction of a resource area (VIM 40/data center) serving as a candidate. The term “reservation” refers to making a request for resource reservation from a candidate area. The term “arrangement plan” refers to arrangement plan creation of the VNF 70 for reserved resources. The term “allocation” refers to the allocation of resources (generation of the VNF 70) based on the arrangement plan. The term “detailed condition” refers to the condition for creating the arrangement plan. The term “condition” refers to the condition obtained by abstracting the detailed condition. The term “total” refers to total resource information. The term “inside an area” refers to resource information inside a management area. Also, as shown in an area indicated by a broken line in FIG. 28, resource information which is not proprietary can be obtained through any path.

The above-described embodiment has a pattern in which the VNFM 30 selects the VIM 40 (data center), the VNFM 30 generates the arrangement plan of the VNF 70, and the VNFM 30 instructs that the VNF 70 for the VIM 40 be generated (a second pattern from the left among patterns of FIG. 28). However, a pattern in which the selection of the VIM (data center) 40 is performed by the orchestrator 20 in place of the VNFM 30 (a first pattern from the left among the patterns of FIG. 28) may be provided.

In the management system 10 according to the present embodiment, the VIM 40 is requested to generate the VNF 70 using detailed information retained by the VNFM 30. Accordingly, the VNF 70 is generated without having to provide a notification of detailed information (specifically, arrangement/startup information and NW configuration information of Table T9 of FIG. 6) from the VNFM 30 to the orchestrator 20. That is, according to the management system 10 according to the present embodiment, it is possible to prevent the leakage of detailed information for implementing the VNF 70 to execute a communication process on virtualization resources. Thereby, multi-vendor applications can be promoted.

For example, even when the VNFM 30 and the orchestrator 20 are provided by separate vendors, detailed information of the VNF 70 which is the know-how of the vendor for providing the VNFM 30 is not leaked to the vendor of the orchestrator 20.

Also, although a mobile communication system for providing a function of mobile communication to a mobile communication terminal is provided in the above-described embodiment, it is unnecessary for the present invention to be the mobile communication system. The present invention can be applied to a fixed communication system for providing a function of fixed communication to a fixed communication terminal. The fixed communication terminal and the fixed communication system are different from the above-described mobile communication system and connected by wire. The above-described embodiment may be an embodiment of a fixed communication system according to the present invention if the mobile communication terminal is replaced with the fixed communication terminal, the mobile communication is replaced with the fixed communication, and the mobile communication system is replaced with the fixed communication system. However, in this case, a specific node is a node according to the fixed communication system. Also, the present invention can be executed in a communication system in which mobile communication and fixed communication are mixed.

That is, the present invention is not limited to the mobile communication terminal, the mobile communication, and the mobile communication system, but can be applied to any communication terminal, any communication, and any communication system as long as a similar framework to the above-described embodiment is provided.

REFERENCE SIGNS LIST

1 Mobile communication system

10 Management system

20 Orchestrator

21 Request reception section

22 Reservation request section

30 VNFM

31 Retention section

32 Virtual server generation request section

40 VIM

41 Monitoring section

42 Reservation section

43 Virtual server generation section

50 OSS/BSS

51 OSS

60 NFVI

70 VNF

80 EMS

101 CPU

102 RAM

103 ROM

104 Communication module

105 Auxiliary storage apparatus 

The invention claimed is:
 1. A management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and wherein the management system includes a virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a plurality of virtualization resource management nodes for managing the virtualization resources in mutually different schemes, and an overall management node for managing all the virtualization resources, wherein at least one of the virtualization resource management nodes includes circuitry configured to: monitor a use state of the virtualization resources; perform reservation by receiving a request of the reservation of necessary resources for generation of the virtual server among the virtualization resources; and generate the virtual server by receiving a request for generating the virtual server on the necessary resources for the generation of the virtual server reserved, wherein the overall management node includes circuitry configured to: receive a request related to a function of the communication process accompanied by the generation of the virtual server in the physical server, wherein the management system includes circuitry configured to: calculate the necessary resources for the generation of the virtual server on the basis of the request received and the use state of the virtualization resources monitored and request the virtualization resource management node to perform the reservation, and wherein the virtual communication-function management node includes circuitry configured to: retain detailed information for implementing the virtual server on the virtualization resources; and generate the request for generating the virtual server on the necessary resources reserved using the detailed information retained for the virtualization resource management node without providing a notification of the detailed information retained to the overall management node, wherein the overall management node, the virtual communication-function management node, and the virtualization resource management node are an orchestrator, virtual network function manager (VNFM), and virtual infrastructure manager (VIM), respectively, which constitute a core network of a mobile communication network, wherein the virtual communication-function management node requests the generation of the virtual server by rewriting the detailed information according to a scheme in which one of the virtualization resource management nodes manages the virtualization resources, the schemes, in which the plurality of virtualization resource management nodes manage the virtualization resources, include OPENSTACK or vCenter.
 2. The management system according to claim 1, wherein the virtual server is constituted of one or more internal functional sections, and the detailed information includes correspondence relationships among resources of each internal functional section and an image file used when starting up the virtual server.
 3. The management system according to claim 1, wherein the detailed information includes the design know-how of a vendor which provides the mobile communication network.
 4. A virtual communication-function management node in a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and wherein the management system includes the virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a plurality of virtualization resource management nodes for managing the virtualization resources in mutually different schemes, and an overall management node for managing all the virtualization resources, wherein the overall management node, the virtual communication-function management node, and the virtualization resource management node are an orchestrator, virtual network function manager (VNFM), and virtual infrastructure manager (VIM), respectively, which constitute a core network of a mobile communication network, the virtual communication-function management node comprising circuitry configured to: retain detailed information for implementing the virtual server on the virtualization resources; and request one of the plurality of virtualization resource management nodes to generate the virtual server on the reserved resources necessary for the generation of the virtual server among the virtualization resources using the detailed information retained without providing a notification of the detailed information retained to the overall management node, wherein the virtual communication-function management node requests the generation of the virtual server by rewriting the detailed information according to a scheme in which one of the virtualization resource management nodes manages the virtualization resources, the schemes, in which the plurality of virtualization resource management nodes manage the virtualization resources, include OPENSTACK or vCenter.
 5. A management method which is a method of operating a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and wherein the management system includes a virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a plurality of virtualization resource management nodes for managing the virtualization resources in mutually different schemes, and an overall management node for managing all the virtualization resources, wherein the virtual communication-function management node includes circuitry configured to: retain detailed information for implementing the virtual server on the virtualization resources, and wherein the management method includes: a monitoring step of monitoring, by the virtualization resource management node, a use state of the virtualization resources; a reservation step of performing, by the virtualization resource management node, reservation by receiving a request of a reservation of resources necessary for the generation of the virtual server among the virtualization resources; a virtual server generation step of generating, by the virtualization resource management node, the virtual server by receiving a request for generating the virtual server on the necessary resources for the generation of the virtual server reserved in the reservation step; a request reception step of receiving, by the overall management node, a request related to a function of the communication process accompanied by the generation of the virtual server in the physical server; a reservation request step of calculating, by the management system, the necessary resources for the generation of the virtual server on the basis of the request received in the request reception step and the use state of the virtualization resources monitored in the monitoring step and requesting the virtualization resource management node to perform the reservation; and a virtual server generation request step of requesting, by one of the virtual communication-function management nodes, the generation of the virtual server on the necessary resources reserved in the reservation step using the detailed information retained for the virtualization resource management node without providing a notification of the detailed information retained to the overall management node, wherein the overall management node, the virtual communication-function management node, and the virtualization resource management node are an orchestrator, virtual network function manager (VNFM), and virtual infrastructure manager (VIM), respectively, which constitute a core network of a mobile communication network, wherein the virtual communication-function management node requests the generation of the virtual server by rewriting the detailed information according to a scheme in which one of the virtualization resource management nodes manages the virtualization resources, the schemes, in which the plurality of virtualization resource management nodes manage the virtualization resources, include OPENSTACK or vCenter.
 6. A management method which is a method of operating a virtual communication-function management node in a management system which is included in a communication system configured to include virtualization resources including a physical server in which a virtual server for executing a communication process is generated and wherein the management system includes the virtual communication-function management node for managing a function of executing the communication process provided in the virtual server, a plurality of virtualization resource management nodes for managing the virtualization resources in mutually different schemes, and an overall management node for managing all the virtualization resources, wherein the virtual communication-function management node includes circuitry configured to: retain detailed information for implementing the virtual server on the virtualization resources, wherein the overall management node, the virtual communication-function management node, and the virtualization resource management node are an orchestrator, virtual network function manager (VNFM), and virtual infrastructure manager (VIM), respectively, which constitute a core network of a mobile communication network, and wherein the management method includes: a virtual server generation request step of requesting one of the virtualization resource management nodes to generate the virtual server on the reserved resources necessary for the generation of the virtual server among the virtualization resources using the detailed information retained without providing a notification of the detailed information retained to the overall management node, wherein the virtual communication-function management node requests the generation of the virtual server by rewriting the detailed information according to a scheme in which one of the virtualization resource management nodes manages the virtualization resources, the schemes, in which the plurality of virtualization resource management nodes manage the virtualization resources, include OPENSTACK or vCenter. 